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Unlike the Promethean Knight, which are controlled by the composed essences of formerly living beings, Soldiers are purely artificial intelligence-driven.[5] Soldiers have a distinctly humanoid appearance in comparison to other Promethean constructs and Sentinels;[6] they have one set of arms with small, five-fingered hands. Their main locomotion is provided by a pair of long, thin legs designed for agility and speed. Soldiers are covered in patterns of light and have a fire-like glow inside their heads. In addition, they are capable of slipspace translocation. Unlike the other Promethean units, Promethean Soldiers are also capable of speech. The Soldiers encountered in the modern era are known to taunt their human opponents in English.[7]

During the Human-Forerunner war, the Ur-Didact deployed Armigers. Due to their bipedal form and agility, the Armigers proved incredibly useful for raiding ancient human warships, particularly when infiltrating the vessels' confined spaces.

Following the conflict, the Didact was forced into exile by the ecumene Council, and his rate was diminished. When the Flood eventually returned, the ecumene found themselves dangerously unprepared, and so the Master BuilderFaber recommissioned the production of Armigers to combat the Flood and to compensate for the dwindling number of Warrior-Servants.